Add support for 'display-mode' MQ defined in Manifest spec

Source/core/testing/InternalSettings.cpp

Index: Source/core/testing/InternalSettings.cpp
diff --git a/Source/core/testing/InternalSettings.cpp b/Source/core/testing/InternalSettings.cpp
index 6b23ec3ae320b9d428f952900b0f3131d1bf503b..937f05b1325d59ac95befc65439265fbe36cedac 100644
--- a/Source/core/testing/InternalSettings.cpp
+++ b/Source/core/testing/InternalSettings.cpp
@@ -66,6 +66,7 @@ InternalSettings::Backup::Backup(Settings* settings)
     , m_originalTextAutosizingWindowSizeOverride(settings->textAutosizingWindowSizeOverride())
     , m_originalAccessibilityFontScaleFactor(settings->accessibilityFontScaleFactor())
     , m_originalMediaTypeOverride(settings->mediaTypeOverride())
+    , m_originalDisplayModeOverride(settings->displayModeOverride())
     , m_originalMockScrollbarsEnabled(settings->mockScrollbarsEnabled())
     , m_originalMockGestureTapHighlightsEnabled(settings->mockGestureTapHighlightsEnabled())
     , m_langAttributeAwareFormControlUIEnabled(RuntimeEnabledFeatures::langAttributeAwareFormControlUIEnabled())
@@ -88,6 +89,7 @@ void InternalSettings::Backup::restoreTo(Settings* settings)
     settings->setTextAutosizingWindowSizeOverride(m_originalTextAutosizingWindowSizeOverride);
     settings->setAccessibilityFontScaleFactor(m_originalAccessibilityFontScaleFactor);
     settings->setMediaTypeOverride(m_originalMediaTypeOverride);
+    settings->setDisplayModeOverride(m_originalDisplayModeOverride);
     settings->setMockScrollbarsEnabled(m_originalMockScrollbarsEnabled);
     settings->setMockGestureTapHighlightsEnabled(m_originalMockGestureTapHighlightsEnabled);
     RuntimeEnabledFeatures::setLangAttributeAwareFormControlUIEnabled(m_langAttributeAwareFormControlUIEnabled);
@@ -371,6 +373,26 @@ void InternalSettings::setAvailablePointerTypes(const String& pointers, Exceptio
     settings()->setAvailablePointerTypes(pointerTypes);
 }
 
+void InternalSettings::setDisplayModeOverride(const String& displayMode, ExceptionState& exceptionState)
+{
+    InternalSettingsGuardForSettings();
+    String token = displayMode.stripWhiteSpace();
+
+    DisplayMode mode = DisplayModeBrowser;
+    if (token == "browser")
+        mode = DisplayModeBrowser;
+    else if (token == "minimal-ui")
+        mode = DisplayModeMinimalUi;
+    else if (token == "standalone")
+        mode = DisplayModeStandalone;
+    else if (token == "fullscreen")
+        mode = DisplayModeFullscreen;
+    else
+        exceptionState.throwDOMException(SyntaxError, "The display-mode token ('" + token + ")' is invalid.");
+
+    settings()->setDisplayModeOverride(mode);
+}
+
 void InternalSettings::setPrimaryPointerType(const String& pointer, ExceptionState& exceptionState)
 {
     InternalSettingsGuardForSettings();